CN107294578B

CN107294578B - Data transmission method and device

Info

Publication number: CN107294578B
Application number: CN201610205911.7A
Authority: CN
Inventors: 张瑞齐; 曲秉玉
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-04-01
Filing date: 2016-04-01
Publication date: 2021-01-29
Anticipated expiration: 2036-04-01
Also published as: CN107294578A; WO2017167184A1

Abstract

The invention discloses a data transmission method and a data transmission device, and belongs to the technical field of wireless communication. The method comprises the following steps: a base station eNB receives rank indication RI of a data channel sent by a user terminal UE, a first precoding matrix indication PMI, and determines a precoding matrix group of data to be transmitted of the UE according to the RI and the first PMI, wherein the precoding matrix group comprises a plurality of precoding matrices; selecting a precoding matrix from the precoding matrix group according to the transmission sequence of the data to be transmitted in the frequency domain and the time domain, and selecting different precoding matrices in the precoding matrix group when the data to be transmitted exists at least at two Resource Element (RE) positions in one Resource Block (RB) for transmitting the data to be transmitted; and carrying out weighting processing on the data to be transmitted through the selected precoding matrix and then transmitting the data to the UE. The device comprises: the device comprises a first receiving module, a first determining module, a first selecting module and a first transmitting module. The invention can improve the precoding performance.

Description

Data transmission method and device

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a data transmission method and apparatus.

Background

A Multiple Input Multiple Output (MIMO) wireless communication system can obtain diversity and array gain through precoding, and therefore, how to perform data transmission in the MIMO wireless communication system is a major concern in the industry.

Currently, when a base station transmits data to a user terminal, the base station (evolved NodeB, eNB) issues a Channel State Information Reference Signal (CSI-RS) to the user terminal (user Equipment, UE), the UE acquires a first Precoding Matrix and a second Precoding Matrix of a current data Channel according to the CSI-RS, the first Precoding Matrix is composed of a plurality of column vectors, the second Precoding Matrix is composed of a column vector selected from the plurality of column vectors and a phase difference between two-stage antennas, and sends a first Precoding Matrix Indicator (PMI) and a second PMI to the eNB, the first PMI includes the first Precoding Matrix, and the second PMI includes the second Precoding Matrix; and the eNB calculates a precoding matrix according to the first precoding matrix and the second precoding matrix, and weights the data to be transmitted through the precoding matrix and then sends the data to the UE.

The prior art has the following problems:

in a scenario of high-speed motion of the UE, a data channel changes rapidly, and when the data channel changes, a phase difference in the second precoding matrix changes, however, when the eNB calculates the precoding matrix according to the second precoding matrix and performs weighting processing on data to be transmitted through the precoding matrix, the phase difference has changed, so that the calculated precoding matrix is not matched with the current data channel, and precoding performance is reduced.

Disclosure of Invention

In order to solve the problems of the prior art, the invention provides a data transmission method and a data transmission device. The technical scheme is as follows:

in a first aspect, an embodiment of the present invention provides a data transmission method, where the method includes:

a base station eNB receives rank indication RI of a data channel sent by a user terminal UE, a first precoding matrix indication PMI, and determines a precoding matrix group of data to be transmitted of the UE according to the RI and the first PMI, wherein the precoding matrix group comprises a plurality of precoding matrices;

selecting a precoding matrix from the precoding matrix group according to the transmission sequence of the data to be transmitted in the frequency domain and the time domain, and selecting different precoding matrices in the precoding matrix group when the data to be transmitted exists at least at two Resource Element (RE) positions in one Resource Block (RB) for transmitting the data to be transmitted;

and carrying out weighting processing on the data to be transmitted through the selected precoding matrix and then transmitting the data to the UE.

In the embodiment of the invention, the UE only reports the RI and the first PMI to the eNB, the eNB determines a precoding matrix group according to the first RI and the first PMI, precoding is selected from the precoding matrix group according to the transmission sequence of data to be transmitted in a frequency domain and a time domain, and different precoding matrices in the precoding matrix group are selected when the data to be transmitted exists at least at two resource element RE positions in one resource block RB for transmitting the data to be transmitted, so that the precoding matrices in the precoding matrix group are used in turn, and the precoding performance is improved.

In one possible design, the determining, according to the RI and the first PMI, a precoding matrix group of data to be transmitted of the UE includes:

determining a first precoding matrix according to the RI and the first PMI, determining a second precoding matrix group according to the first precoding matrix and each phase difference in a phase difference set, and determining a precoding matrix group of data to be transmitted of the UE according to the first precoding matrix and the second precoding matrix group, wherein the phase difference set is used for storing the phase difference between two groups of polarized antennas; alternatively, the first and second electrodes may be,

receiving a second PMI transmitted by the UE, wherein the second PMI comprises an indication of column vector selection, determining a first precoding matrix according to the RI and the first PMI, determining a second precoding matrix group according to each phase difference in a column vector and phase difference set determined by the indication of column vector selection, and determining a precoding matrix group of data to be transmitted of the UE according to the first precoding matrix and the second precoding matrix group, wherein the phase difference set is used for storing the phase difference between two groups of polarized antennas.

In the embodiment of the invention, the eNB uses each phase difference in the phase difference set in turn so as to construct a precoding matrix group, and when the data to be transmitted is transmitted to the UE, the precoding matrix in the precoding matrix group is used in turn so as to improve the precoding performance.

In the embodiment of the present invention, the UE may also report the phase difference in the second PMI, so that the eNB constructs a precoding matrix group according to the phase difference, and when transmitting the data to be transmitted to the UE, the precoding matrices in the precoding matrix group are used in turn, thereby improving precoding performance.

In another possible design, the first precoding matrix is

Wherein, W₁Is N_tX 2M matrix, N_tThe number of antenna ports included for the eNB, X being composed of the plurality of column vectors

M is the number of column vectors included in X.

In another possible design, the selecting a precoding matrix from the precoding matrix group according to the transmission order of the data to be transmitted in the frequency domain and the time domain includes:

and selecting a precoding matrix from the precoding matrix group according to a predefined selection sequence according to the transmission sequence of the data to be transmitted in the frequency domain and the time domain.

When the data to be transmitted is transmitted to the UE, the precoding matrixes in the precoding matrix group are used in turn according to the transmission sequence of the data to be transmitted in the frequency domain and the time domain, so that the precoding performance is improved.

In another possible design, the precoding matrix W ═ V included in the precoding matrix group₀ … V_R-1]Each column vector of (1) has the following constitution

Wherein, V_iIs N_tA column vector of x 1, and,

is a plurality of modulo 1 and

values belonging to 1, -1, j, -j, N_tThe number of antenna ports included by the eNB, R is the rank of the data channel included by the RI, v_iIs a column vector in a diagonal block matrix X in a first precoding matrix determined according to said first PMI 1.

In another possible design, the RI includes a rank of the data channel;

the method further comprises the following steps:

determining the number of ports of a demodulation reference symbol (DMRS) of the data channel according to the rank of the data channel, wherein the number of the ports of the DMRS is an even number which is greater than or equal to the rank of the data channel.

In the embodiment of the present invention, the eNB may further determine the number of ports of the DMRS according to the rank of the data channel, and transmit the data to be transmitted to the UE through the DMRS ports.

In another possible design, the method further includes:

determining a weighting matrix of the DMRS of the data channel according to the selected precoding matrix, wherein each column vector in the weighting matrix of the DMRS can be expressed as:

or

v_iA column vector selected for an indication of selection of a column vector in a second PMI in the selected precoding matrix.

In the embodiment of the present invention, the eNB may further determine a weighting matrix of the DMRS according to the selected precoding matrix.

In another possible design, within the RB, the same v is included in different precoding matrices selected by the base station for the data to be transmitted₀～v_R-1Said v is_iAn indication for selecting a column vector in a second PMI in the selected precoding matrix, i being an integer greater than or equal to 0 and less than or equal to R-1;

within the RB, the base station selects different precoding matrixes from among the different precoding matrixes for the data to be transmitted

Is different from that of

A phase difference between two sets of polarized antennas included for a second PMI in the selected precoding matrix.

In another possible design, the method further includes:

and sending first configuration information or second configuration information to the UE, wherein the first configuration information is used for indicating that the UE only feeds back the RI and the first PMI when feeding back channel state information to the eNB, and the second configuration information is used for indicating that the UE feeds back an indication of column vector selection in the RI, the first PMI and the second PMI when feeding back the channel state information to the eNB.

In the embodiment of the present invention, the eNB may configure a feedback manner of the PMI to the UE in advance.

In another possible design, the first configuration information or the second configuration information is further used to instruct the UE to feed back a channel quality index, CQI, when feeding back channel state information to the eNB;

the method further comprises the following steps:

receiving CQI of a data channel sent by the UE according to the first configuration information or the second configuration information;

the transmitting the data to be transmitted after the weighting processing is performed on the data to be transmitted through the selected precoding matrix to the UE includes:

dividing the data to be transmitted into a plurality of data blocks according to the CQI;

and respectively carrying out weighting processing on each data block in the plurality of data blocks through the selected precoding matrix and then transmitting the data blocks to the UE.

In the embodiment of the invention, the UE can also report the CQI of the data channel to the eNB, so that the eNB can perform block coding on the data to be transmitted according to the CQI and send the data, and the transmission efficiency is improved.

In a second aspect, an embodiment of the present invention provides a data transmission method, where the method includes the steps of

A base station eNB receives rank indication RI of a data channel sent by user equipment UE, determines a pre-coding matrix group of data to be transmitted of the UE according to the RI, and transmits the pre-coding matrix group to the UE so that the UE decodes the data to be transmitted according to the pre-coding matrix group, wherein the pre-coding matrix group comprises a plurality of pre-coding matrixes;

In the embodiment of the invention, the UE only reports the RI to the eNB, the eNB determines a precoding matrix group according to the first RI, precoding is selected from the precoding matrix group according to the transmission sequence of data to be transmitted in a frequency domain and a time domain, and different precoding matrixes in the precoding matrix group are selected when the data to be transmitted exists at least at two resource element RE positions in one resource block RB for transmitting the data to be transmitted, so that the precoding matrixes in the precoding matrix group are used in turn, and the precoding performance is improved.

In one possible design, the transmitting the set of precoding matrices to the UE includes:

and issuing the precoding matrix group to the UE through a Radio Resource Control (RRC) signaling.

In the embodiment of the invention, the precoding matrix group is issued to the UE through RRC signaling, so that the transmission efficiency is improved.

In another possible design, the method further includes:

and sending third configuration information to the UE, wherein the third configuration information is used for indicating that the UE only feeds back the RI when feeding back the channel state information to the eNB.

In another possible design, the third configuration information is further used to instruct the UE to feed back a channel quality index, CQI, when feeding back channel state information to the eNB;

the method further comprises the following steps:

receiving the CQI of the data channel sent by the UE according to the third configuration information;

In a third aspect, an embodiment of the present invention provides a data transmission method, where the method includes:

a user terminal UE determines the rank of a data channel and a first precoding matrix according to a channel state information reference symbol CSI-RS issued by a base station eNB;

sending a rank indication (PMI) and a first Precoding Matrix Indication (PMI) to the eNB, wherein the rank indication comprises the RI, and the first PMI comprises the first precoding matrix, so that the eNB determines a precoding matrix group according to the rank and the first precoding matrix and selects a precoding matrix from the precoding matrix group, and the data to be transmitted of the UE is weighted by the selected precoding matrix and then transmitted to the UE;

and receiving the weighted transmission data issued by the eNB, determining the selected precoding matrix according to the transmission sequence of the transmission data in the frequency domain and the time domain, and demodulating the weighted transmission data through the selected precoding matrix.

In one possible design, the determining the selected precoding matrix according to the transmission order of the transmission data in the frequency domain and the time domain includes:

determining a precoding matrix group according to the RI and the first PMI, and selecting a precoding matrix from the precoding matrix group according to the transmission sequence of the transmission data in the frequency domain and the time domain; alternatively, the first and second electrodes may be,

and receiving a precoding matrix group sent by the eNB, and selecting a precoding matrix from the precoding matrix group according to the transmission sequence of the transmission data in the frequency domain and the time domain.

In the embodiment of the present invention, the UE may also select a precoding matrix from the precoding matrix group according to the determined precoding matrix group or the precoding matrix group received from the eNB, and according to the transmission sequence of the transmission data in the frequency domain and the time domain, so as to ensure that the UE and the eNB select the same precoding matrix.

In another possible design, the method further includes:

receiving first configuration information sent by the eNB, wherein the first configuration information is used for indicating that the UE only feeds back the RI and the first PMI when feeding back channel state information to the eNB;

the determining the rank and the first precoding matrix of the data channel according to the CSI-RS includes:

and determining the rank and a first precoding matrix of a data channel according to the first configuration information and the CSI-RS.

In the embodiment of the present invention, the eNB may configure a feedback mode of the PMI to the UE in advance, so that the UE performs feedback according to the feedback mode configured by the eNB.

In another possible design, the method further includes:

determining an indication of column vector selection, and sending a second PMI to the eNB, wherein the second PMI comprises the indication of column vector selection, so that the eNB determines a precoding matrix group according to the RI, the first PMI and the indication of column vector selection.

In another possible design, the method further includes:

receiving second configuration information sent by the eNB, wherein the second configuration information is used for indicating that the UE feeds back an indication of column vector selection in the RI, the first PMI and the second PMI when feeding back channel state information to the eNB;

the determining an indication of column vector selection in the second PMI includes:

and determining an indication of column vector selection in the second PMI according to the second configuration information.

the method further comprises the following steps:

calculating the CQI of the data channel when selecting a precoding matrix from the precoding matrix group according to a predefined selection sequence according to the sequence of the frequency domain and the time domain of the transmission data;

and sending the CQI to the eNB according to the first configuration information or the second configuration information.

Wherein, V_iIs N_tA column vector of x 1, and,

is a plurality of modulo 1 and

Is different from that of

In another possible design, the number of CQIs is independent of the rank of the data channel.

In another possible design, the method further includes:

In a fourth aspect, an embodiment of the present invention provides a data transmission method, where the method includes:

a user terminal UE receives a channel state information reference symbol CSI-RS issued by a base station eNB, and determines the rank of a data channel according to the CSI-RS;

sending Rank Indication (RI) to a base station eNB, wherein the RI comprises the rank of the data channel, so that the eNB determines a precoding matrix group according to the rank and selects a precoding matrix from the precoding matrix group, and the selected precoding matrix is used for carrying out weighting processing on data to be transmitted of the UE and then transmitting the data to the UE;

and receiving the precoding matrix group and the transmission data after weighting processing sent by the eNB, selecting the precoding matrix from the precoding matrix group according to the transmission sequence of the transmission data in the frequency domain and the time domain, and demodulating the transmission data after weighting processing through the selected precoding matrix.

In one possible design, the method further includes:

receiving third configuration information sent by the eNB, wherein the third configuration information is used for indicating that the UE only feeds back the RI when feeding back the channel state information to the eNB;

the determining a rank of a data channel according to the CSI-RS includes:

and determining the rank of a data channel according to the third configuration information and the CSI-RS.

In another possible design, the third configuration information may further be used to instruct the UE to feed back a channel quality index, CQI, when feeding back channel state information to the eNB

The method further comprises the following steps:

and transmitting the CQI to the eNB according to the third configuration information.

In a fifth aspect, an embodiment of the present invention provides a data transmission apparatus, where the apparatus includes:

the first receiving module is used for receiving a Rank Indication (RI) of a data channel sent by a User Equipment (UE), and a first Precoding Matrix Indication (PMI);

a first determining module, configured to determine, according to the RI and the first PMI, a precoding matrix group of data to be transmitted of the UE, where the precoding matrix group includes multiple precoding matrices;

the first selection module is used for selecting a precoding matrix from the precoding matrix group according to the transmission sequence of the data to be transmitted in the frequency domain and the time domain, and selecting different precoding matrices in the precoding matrix group when the data to be transmitted exists at least at two Resource Element (RE) positions in one Resource Block (RB) for transmitting the data to be transmitted;

and the first transmission module is used for performing weighting processing on the data to be transmitted through the selected precoding matrix and then transmitting the data to the UE.

In one possible design, the first determining module includes:

a first determining unit, configured to determine a first precoding matrix according to the RI and the first PMI;

a second determining unit, configured to determine a second precoding matrix group according to the first precoding matrix and each phase difference in a phase difference set, where the phase difference set is used to store phase differences between two groups of polarized antennas;

a third determining unit, configured to determine, according to the first precoding matrix and the second precoding matrix group, a precoding matrix group of the data to be transmitted of the UE; alternatively, the first and second electrodes may be,

the first determining module includes:

a first receiving unit, configured to receive a second PMI transmitted by the UE, where the second PMI includes an indication of column vector selection;

a fourth determining unit, configured to determine a first precoding matrix according to the RI and the first PMI;

a fifth determining unit, configured to determine a second precoding matrix group according to the column vector selected by the indication determination and each phase difference in a phase difference set, where the phase difference set is used to store phase differences between two groups of polarized antennas;

a sixth determining unit, configured to determine, according to the first precoding matrix and the second precoding matrix group, a precoding matrix group of the data to be transmitted of the UE.

In another possible design, the first precoding matrix is

M is the number of column vectors included in X.

In another possible design, the first selection module includes:

and the first selection unit is used for selecting a precoding matrix from the precoding matrix group according to the transmission sequence of the data to be transmitted in the frequency domain and the time domain and according to a predefined selection sequence.

Wherein, V_iIs N_tA column vector of x 1, and,

is a plurality of modulo 1 and

values belonging to 1, -1, j, -j, N_tThe number of antenna ports included by the eNB, R is the rank of the data channel included by the RI, v_iIs a column vector in a diagonal block matrix X in a first precoding matrix determined according to the first PMI. In another possible design, the RI includes a rank of the data channel;

the device further comprises:

a second determining module, configured to determine, according to the rank of the data channel, the number of ports of a demodulation reference symbol, DMRS, of the data channel, where the number of ports of the DMRS is an even number greater than or equal to the rank of the data channel.

In another possible design, the apparatus further includes:

a third determining module, configured to determine, according to the selected precoding matrix, a weighting matrix for the DMRS of the data channel, where each column vector in the weighting matrix for the DMRS may be represented as:

or

v_iFor the second PM in the selected precoding matrixI indication of column vector selection.

Is different from that of

In another possible design, the apparatus further includes:

a first sending module, configured to send first configuration information or second configuration information to the UE, where the first configuration information is used to indicate that the UE only feeds back the RI and the first PMI when feeding back channel state information to the eNB, and the second configuration information is used to indicate that the UE feeds back an indication of column vector selection among the RI, the first PMI, and the second PMI when feeding back channel state information to the eNB.

the device further comprises:

the first receiving module is further configured to receive a CQI of a data channel sent by the UE according to the first configuration information or the second configuration information;

the first transmission module includes:

a first dividing unit, configured to divide the data to be transmitted into multiple data blocks according to the CQI;

and the first transmission unit is used for performing weighting processing on each data block in the plurality of data blocks through the selected precoding matrix and then transmitting the data blocks to the UE.

In a sixth aspect, an embodiment of the present invention provides a data transmission apparatus, where the apparatus includes

A second receiving module, configured to receive a rank indication RI of a data channel sent by a user equipment UE;

a fourth determining module, configured to determine, according to the RI, a precoding matrix group of the data to be transmitted of the UE;

a second transmission module, configured to transmit the precoding matrix group to the UE, so that the UE decodes the data to be transmitted according to the precoding matrix group, where the precoding matrix group includes multiple precoding matrices;

a second selection module, configured to select a precoding matrix from the precoding matrix group according to a transmission sequence of the data to be transmitted in a frequency domain and a time domain, and select different precoding matrices in the precoding matrix group when the data to be transmitted exists at least at two resource element RE positions in one resource block RB in which the data to be transmitted is transmitted;

and the third transmission module is used for performing weighting processing on the data to be transmitted through the selected precoding matrix and then transmitting the data to the UE.

In a possible design, the second transmission module is configured to issue the precoding matrix group to the UE through radio resource control RRC signaling.

In another possible design, the apparatus further includes:

a second sending module, configured to send third configuration information to the UE, where the third configuration information is used to instruct the UE to only feed back the RI when feeding back the channel state information to the eNB.

the device further comprises:

a third receiving module, configured to receive a CQI of a data channel sent by the UE according to the third configuration information;

the third transmission module includes:

a second dividing unit, configured to divide the data to be transmitted into multiple data blocks according to the CQI;

and a second transmission unit, configured to perform weighting processing on each of the multiple data blocks through the selected precoding matrix, and then transmit the weighted data block to the UE.

In a seventh aspect, an embodiment of the present invention provides a data transmission apparatus, where the apparatus includes:

the fourth receiving module is used for receiving a channel state information reference symbol CSI-RS issued by the base station eNB;

a fifth determining module, configured to determine a rank and a first precoding matrix of a data channel according to the CSI-RS;

a third sending module, configured to send a rank indication and a first precoding matrix indication PMI to the eNB, where the rank indication includes the RI, and the first PMI includes the first precoding matrix, so that the eNB determines a precoding matrix group according to the rank and the first precoding matrix and selects a precoding matrix from the precoding matrix group, and transmits data to be transmitted of the UE to the UE after performing weighting processing on the data to be transmitted of the UE through the selected precoding matrix;

a fourth receiving module, configured to receive the transmission data after the weighting processing sent by the eNB;

a sixth determining module, configured to determine the selected precoding matrix according to a transmission sequence of the transmission data in a frequency domain and a time domain;

and the first demodulation module is used for demodulating the weighted transmission data through the selected precoding matrix.

In one possible design, the sixth determining module includes:

an eighth determining unit, configured to determine a precoding matrix group according to the RI and the first PMI;

a second selecting unit, configured to select a precoding matrix from the precoding matrix group according to a transmission order of the transmission data in a frequency domain and a time domain; alternatively, the first and second electrodes may be,

the sixth determining module includes:

a second receiving unit, configured to receive the precoding matrix group sent by the eNB;

and a third selecting unit, configured to select a precoding matrix from the precoding matrix group according to a transmission order of the transmission data in a frequency domain and a time domain.

In another possible design, the apparatus further includes:

a fifth receiving module, configured to receive first configuration information sent by the eNB, where the first configuration information is used to instruct the UE to only feed back the RI and the first PMI when feeding back channel state information to the eNB;

the fifth determining module is configured to determine a rank and a first precoding matrix of a data channel according to the first configuration information and the CSI-RS.

In another possible design, the apparatus further includes:

a seventh determining module for determining an indication of column vector selection;

a fourth sending module, configured to send a second PMI to the eNB, where the second PMI includes an indication of the column vector selection, so that the eNB determines a precoding matrix group according to the RI, the first PMI, and the indication of the column vector selection.

In another possible design, the apparatus further includes:

a sixth receiving module, configured to receive second configuration information sent by the eNB, where the second configuration information is used to instruct the UE to feed back an indication of column vector selection among the RI, the first PMI, and the second PMI when feeding back channel state information to the eNB;

the seventh determining module is configured to determine, according to the second configuration information, an indication of column vector selection in the second PMI.

the device further comprises:

a first calculating module, configured to calculate a CQI of the data channel when a precoding matrix is selected from the precoding matrix group according to a predefined selection order based on an order of a frequency domain and a time domain of the transmission data;

a fifth sending module, configured to send the CQI to the eNB according to the first configuration information or the second configuration information.

Wherein, V_iIs N_tA column vector of x 1, and,

is a plurality of modulo 1 and

values belonging to 1, -1, j, -j, N_tThe number of antenna ports included by the eNB, R is the rank of the data channel included by the RI, v_iIs a column vector in a diagonal block matrix X in a first precoding matrix determined according to the first PMI.

Is different from that of

In another possible design, the apparatus further includes:

an eighth determining module, configured to determine, according to the rank of the data channel, the number of ports of a demodulation reference symbol, DMRS, of the data channel, where the number of ports of the DMRS is an even number greater than or equal to the rank of the data channel.

In an eighth aspect, an embodiment of the present invention provides a data transmission apparatus, where the apparatus includes:

a seventh receiving module, configured to receive a channel state information reference symbol CSI-RS sent by a base station eNB;

a ninth determining module, configured to determine a rank of a data channel according to the CSI-RS;

a sixth sending module, configured to send a rank indication RI to a base station eNB, where the RI includes a rank of the data channel, so that the eNB determines a precoding matrix group according to the rank and selects a precoding matrix from the precoding matrix group, and transmits the data to be transmitted of the UE to the UE after performing weighting processing on the data to be transmitted of the UE through the selected precoding matrix;

a seventh receiving module, configured to receive the precoding matrix group and the weighted transmission data sent by the eNB;

a tenth determining module, configured to select the precoding matrix from the precoding matrix group according to a transmission order of the transmission data in a frequency domain and a time domain;

and the second demodulation module is used for demodulating the weighted transmission data through the selected precoding matrix.

In one possible design, the apparatus further includes:

an eighth receiving module, configured to receive third configuration information sent by the eNB, where the third configuration information is used to instruct the UE to only feed back the RI when feeding back channel state information to the eNB;

the ninth determining module is configured to determine a rank of a data channel according to the third configuration information and the CSI-RS.

The device further comprises:

a second calculating module, configured to calculate a CQI of the data channel when a precoding matrix is selected from the precoding matrix group according to a predefined selection order based on an order of a frequency domain and a time domain of the transmission data;

a seventh sending module, configured to send the CQI to the eNB according to the third configuration information.

In a ninth aspect, an embodiment of the present invention provides a data transmission apparatus, where the apparatus includes: a first receiver, a first processor, and a first reflector;

the first receiver is configured to receive a rank indication RI of a data channel sent by a user equipment UE, where a first precoding matrix indicates a PMI;

the first processor is configured to determine a precoding matrix group of data to be transmitted of the UE according to the RI and the first PMI, where the precoding matrix group includes a plurality of precoding matrices;

the first processor is configured to select a precoding matrix from the precoding matrix group according to a transmission sequence of the data to be transmitted in a frequency domain and a time domain, and select different precoding matrices in the precoding matrix group when the data to be transmitted exists at least at two resource element RE positions in one resource block RB in which the data to be transmitted is transmitted;

and the first reflector is used for performing weighting processing on the data to be transmitted through the selected precoding matrix and then transmitting the data to the UE.

In one possible design, the first processor is configured to determine a first precoding matrix according to the RI and the first PMI; determining a second precoding matrix group according to the first precoding matrix and each phase difference in the phase difference set; determining a precoding matrix group of the data to be transmitted of the UE according to the first precoding matrix and the second precoding matrix group, wherein the phase difference set is used for storing phase differences between two groups of polarized antennas; alternatively, the first and second electrodes may be,

the first processor is configured to receive a second PMI transmitted by the UE, where the second PMI includes an indication of column vector selection; determining a first precoding matrix according to the RI and the first PMI; determining a second precoding matrix group based on the column vector selected and each phase difference in the set of phase differences; and determining a precoding matrix group of the data to be transmitted of the UE according to the first precoding matrix and the second precoding matrix group, wherein the phase difference set is used for storing the phase difference between two groups of polarized antennas.

In another possible design, the first precoding matrix is

M is the number of column vectors included in X.

In another possible design, the first processor is configured to select a precoding matrix from the precoding matrix group according to a predefined selection order according to a transmission order of the data to be transmitted in a frequency domain and a time domain.

In another possible design, the precoding matrix W ═ V included in the precoding matrix group₀ … V_R-1]Each column vector of, e.g.The lower form

Wherein, V_iIs N_tA column vector of x 1, and,

is a plurality of modulo 1 and

the first processor is used for determining the number of ports of a demodulation reference symbol (DMRS) of the data channel according to the rank of the data channel, wherein the number of the ports of the DMRS is an even number which is greater than or equal to the rank of the data channel.

In another possible design, the first processor is configured to determine a weighting matrix for the DMRS for the data channel according to the selected precoding matrix, and each column vector in the weighting matrix for the DMRS may be represented as:

or

v_iAn indication of column vector selection in a second PMI in the selected precoding matrix.

Is different from that of

In another possible design, the first transmitter is configured to transmit, to the UE, first configuration information or second configuration information, where the first configuration information is used to instruct the UE to feed back only the RI and the first PMI when feeding back channel state information to the eNB, and the second configuration information is used to instruct the UE to feed back an indication of selection of a column vector among the RI, the first PMI, and the second PMI when feeding back channel state information to the eNB.

the first receiver is configured to receive a CQI of a data channel sent by the UE according to the first configuration information or the second configuration information;

the first processor is configured to divide the data to be transmitted into a plurality of data blocks according to the CQI; and respectively carrying out weighting processing on each data block in the plurality of data blocks through the selected precoding matrix and then transmitting the data blocks to the UE.

In a tenth aspect, an embodiment of the present invention provides a data transmission apparatus, where the apparatus includes: a second receiver, a second processor, and a second transmitter;

the second receiver is configured to receive a rank indication RI of a data channel sent by a user equipment UE;

the second processor is configured to determine, according to the RI, a precoding matrix group of data to be transmitted of the UE; transmitting the precoding matrix group to the UE so that the UE decodes the data to be transmitted according to the precoding matrix group, wherein the precoding matrix group comprises a plurality of precoding matrixes;

the second processor is further configured to select a precoding matrix from the precoding matrix group according to a transmission sequence of the data to be transmitted in a frequency domain and a time domain, and select different precoding matrices in the precoding matrix group when the data to be transmitted exists at least at two resource element RE positions in one resource block RB in which the data to be transmitted is transmitted;

and the second transmitter is used for performing weighting processing on the data to be transmitted through the selected precoding matrix and then transmitting the data to the UE.

In one possible design, the second transmitter is further configured to issue the precoding matrix group to the UE through radio resource control RRC signaling.

In another possible design, the second transmitter is further configured to transmit third configuration information to the UE, where the third configuration information is used to instruct the UE to only feed back the RI when feeding back channel state information to the eNB.

the second receiver is further configured to receive a CQI of a data channel sent by the UE according to the third configuration information;

the second transmitter is further configured to divide the data to be transmitted into a plurality of data blocks according to the CQI; and respectively carrying out weighting processing on each data block in the plurality of data blocks through the selected precoding matrix and then transmitting the data blocks to the UE.

In an eleventh aspect, an embodiment of the present invention provides a data transmission apparatus, where the apparatus includes: a third receiver, a third processor, and a third transmitter;

the third receiver is configured to receive a channel state information reference symbol CSI-RS issued by a base station eNB;

the third processor is configured to determine a rank and a first precoding matrix of a data channel according to the CSI-RS;

the third transmitter is configured to send a rank indication and a first precoding matrix indication PMI to the eNB, where the rank indication includes the RI, and the first PMI includes the first precoding matrix, so that the eNB determines a precoding matrix group according to the rank and the first precoding matrix, selects a precoding matrix from the precoding matrix group, performs weighting processing on data to be transmitted of the UE through the selected precoding matrix, and transmits the data to the UE;

the third receiver is further configured to receive the transmission data after the weighting processing sent by the eNB;

the third processor is further configured to determine the selected precoding matrix according to a transmission order of the transmission data in a frequency domain and a time domain;

the third processor is further configured to demodulate the weighted transmission data through the selected precoding matrix.

In one possible design, the third processor is further configured to determine a precoding matrix group according to the RI and the first PMI; selecting a precoding matrix from the precoding matrix group according to the transmission sequence of the transmission data in the frequency domain and the time domain; alternatively, the first and second electrodes may be,

the third processor is further configured to receive a precoding matrix group sent by the eNB, and select a precoding matrix from the precoding matrix group according to a transmission sequence of the transmission data in a frequency domain and a time domain.

In another possible design, the third processor is further configured to determine an indication of column vector selection;

the third transmitter is further configured to transmit a second PMI to the eNB, where the second PMI includes the indication of the column vector selection, so that the eNB determines a precoding matrix group according to the RI, the first PMI, and the indication of the column vector selection.

In another possible design, the third receiver is further configured to receive second configuration information sent by the eNB, where the second configuration information is used to instruct the UE to feed back an indication of column vector selection among the RI, the first PMI, and the second PMI when feeding back channel state information to the eNB;

the third processor is further configured to determine, according to the second configuration information, an indication of column vector selection in the second PMI.

the third processor is further configured to calculate a CQI of the data channel when a precoding matrix is selected from the precoding matrix group according to a predefined selection order according to the order of the frequency domain and the time domain of the transmission data;

the third transmitter is further configured to send the CQI to the eNB according to the first configuration information or the second configuration information.

Wherein, V_iIs N_tA column vector of x 1, and,

is a plurality of modulo 1 and

In another possible design, within the RB, the base station selects different precoding matrices for the data to be transmittedIn (a) contains the same v₀～v_R-1Said v is_iAn indication for selecting a column vector in a second PMI in the selected precoding matrix, i being an integer greater than or equal to 0 and less than or equal to R-1;

Is different from that of

In another possible design, the third processor is further configured to determine, according to the rank of the data channel, a number of ports of a demodulation reference symbol, DMRS, of the data channel, the number of ports of the DMRS being an even number greater than or equal to the rank of the data channel.

In a twelfth aspect, an embodiment of the present invention provides a data transmission apparatus, where the apparatus includes: a fourth receiver, a fourth processor, and a fourth transmitter;

the fourth receiver is configured to receive a channel state information reference symbol CSI-RS issued by the base station eNB;

the fourth processor is configured to determine a rank of a data channel according to the CSI-RS;

the fourth transmitter is configured to send a rank indication RI to a base station eNB, where the RI includes a rank of the data channel, so that the eNB determines a precoding matrix group according to the rank and selects a precoding matrix from the precoding matrix group, and transmits data to be transmitted of the UE to the UE after performing weighting processing on the data to be transmitted by using the selected precoding matrix;

the fourth receiver is further configured to receive the precoding matrix group and the weighted transmission data sent by the eNB;

the fourth processor is further configured to select the precoding matrix from the precoding matrix group according to a transmission order of the transmission data in a frequency domain and a time domain;

the fourth processor is further configured to demodulate the weighted transmission data through the selected precoding matrix.

In one possible design, the fourth receiver further receives third configuration information sent by the eNB, where the third configuration information is used to instruct the UE to only feed back the RI when feeding back channel state information to the eNB;

the fourth processor is further configured to determine a rank of a data channel according to the third configuration information and the CSI-RS.

The fourth processor is further configured to calculate a CQI of the data channel when a precoding matrix is selected from the precoding matrix group according to a predefined selection order based on the order of the frequency domain and the time domain of the transmission data;

the fourth transmitter is further configured to transmit the CQI to the eNB according to the third configuration information.

Drawings

Fig. 1 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another data transmission apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of another apparatus for data transmission according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of another apparatus for data transmission according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of another apparatus for data transmission according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of another apparatus for data transmission according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of an apparatus for data transmission according to another embodiment of the present invention;

FIG. 8 is a schematic diagram of an apparatus for data transmission according to another embodiment of the present invention;

fig. 9 is a flowchart of a data transmission method according to an embodiment of the present invention;

fig. 10 is a flowchart of a data transmission method according to an embodiment of the present invention;

fig. 11 is a flowchart of a data transmission method according to an embodiment of the present invention;

fig. 12 is a flowchart of a data transmission method according to an embodiment of the present invention;

FIG. 13-1 is a flow chart of a data transmission method according to an embodiment of the present invention;

FIG. 13-2 is a diagram of a first precoding matrix provided by an embodiment of the invention;

fig. 13-3 are schematic diagrams of an antenna port provided in an embodiment of the present invention;

fig. 13-4 is a schematic diagram of a first precoding matrix and a second precoding matrix provided by an embodiment of the present invention;

fig. 14 is a flowchart of a data transmission method according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the downlink transmission mode 9 or 10, when the eNB transmits data to the UE, the eNB first transmits a CSI-RS to the UE, where the CSI-RS is used to acquire channel state information of a data channel; the UE receives the CSI-RS sent by the eNB and measures a first precoding matrix and a second precoding matrix according to the CSI-RS, wherein the first precoding matrix is a block diagonal matrix formed by a plurality of column vectors; the second precoding matrix comprises an indication selected from column vectors in the first precoding matrix and a phase difference between two groups of polarized antennas, and a first PMI and a second PMI are sent to the eNB, wherein the first PMI comprises the first precoding matrix, and the second PMI comprises the second precoding matrix; the eNB receives a first PMI and a second PMI sent by the UE, determines a precoding matrix according to a first precoding matrix included by the first PMI and a second precoding matrix included by the second PMI, and transmits data to be transmitted of the UE to the UE after weighting processing is performed on the data to be transmitted of the UE through the precoding matrix.

In a scene of high-speed movement of the UE, a data channel changes rapidly, when the data channel changes, a phase difference in the second precoding matrix changes, however, when the eNB calculates the precoding matrix according to the second precoding matrix and performs weighting processing on data to be transmitted through the precoding matrix, the phase difference changes, so that the calculated precoding matrix is not matched with the current data channel, and precoding performance is reduced.

Since the first precoding matrix reflects indexes of a plurality of column vectors, and the column vectors have a non-frequency selective and long period characteristic, the first precoding matrix is still effective even in a high-speed motion scene.

Since the second precoding matrix comprises an indication of column vector selection and a phase difference between two sets of polarized antennas, the effect of the indication of column vector selection is to select one or two column vectors from a plurality of column vectors, the column vectors selected by the second precoding matrix are still valid in a high-speed motion scene, i.e. the indication of column vector selection in the second precoding matrix is valid, but the phase difference comprised in the second precoding matrix is rapidly changing, i.e. the phase difference is invalid.

Since the rank of the data channel is slowly changing, the rank of the data channel is still considered to be effective in high-speed motion scenarios. The speed of the change of the CQI of the data channel is related to the motion speed of the UE and the transmission mode used, and if the slowly changing precoding matrix is weighted for the data channel and the rapidly changing precoding matrix is used in turn in time domain and frequency domain, the CQI will also be slowly changing, that is, the CQI of the data channel is still valid.

In summary, the PMI includes fast-varying information and slow-varying information, and the UE measures and feeds back the slow-varying information according to the CSI-RS; the eNB combines the alternate use of the fast-changing information according to the slow-changing information reported by the UE, so that the downlink data transmission can obtain partial beamforming gain and is insensitive to the moving speed of the user.

Therefore, in the embodiment of the present invention, the UE may report the first precoding matrix and the rank of the data channel to the eNB, the eNB uses the column vector in the first precoding matrix in the RB or RB group according to the first precoding matrix and the rank of the data channel, and uses each phase difference in the phase difference set in turn, thereby forming a precoding matrix group, and selects a precoding matrix from the precoding matrix group according to the transmission order of the data to be transmitted in the frequency domain and the time domain.

In the embodiment of the present invention, the UE may also report the indication of the column vector selection in the first precoding matrix and the second precoding matrix, and the rank of the data channel to the eNB. And the eNB uses each phase difference in the phase difference set in turn according to the indication of the column vector selection in the first precoding matrix and the second precoding matrix and the rank of the data in the RB or the RB group so as to form a precoding matrix group, and selects a precoding matrix from the precoding matrix group according to the transmission sequence of the data to be transmitted in the frequency domain and the time domain.

In the embodiment of the present invention, the UE may also report only the rank of the data channel. And the eNB constructs a precoding matrix group according to the rank of the data channel, and selects a precoding matrix from the precoding matrix group according to the transmission sequence of the data to be transmitted in the frequency domain and the time domain.

Referring to fig. 1, fig. 1 is a block diagram of a data transmission device according to an embodiment of the present invention, which may have a relatively large difference due to different configurations or performances, and may include one or more first receivers 101, a first processor 102, and a first reflector 103.

A first receiver 101, configured to receive a rank indication RI of a data channel sent by a user equipment UE, where a first precoding matrix indicates a PMI;

the first processor 102 is configured to determine, according to the RI and the first PMI, a precoding matrix group of data to be transmitted of the UE, where the precoding matrix group includes a plurality of precoding matrices;

the first processor 102 is configured to select a precoding matrix from a precoding matrix group according to a transmission sequence of data to be transmitted in a frequency domain and a time domain, and select different precoding matrices in the precoding matrix group when the data to be transmitted exists at least at two resource element RE positions in one resource block RB in which the data to be transmitted is transmitted;

and the first reflector 103 is configured to perform weighting processing on data to be transmitted through the selected precoding matrix and transmit the data to the UE.

Optionally, the data transmission device may include other components besides the first receiver 101, the first processor 102 and the first transmitter 103. For example, a first memory 104, one or more first storage media 107 (e.g., one or more mass storage devices) storing a first application 105 or first data 106 may also be included. Wherein the first memory 104 and the first storage medium 107 may be transient storage or persistent storage. The program stored in the first storage medium 107 may include one or more modules (not shown), each of which may include a series of instruction operations in a device for data transmission. Still further, the first processor 102 may be configured to communicate with the first storage medium 107 to execute a series of instruction operations in the first storage medium 107 on a data transfer device.

The means for data transfer may also include one or more first power supplies 108, one or more first wired or wireless network interfaces 109, one or more first input-output interfaces 110, one or more first keyboards 111, and/or one or more first operating systems 112, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, and the like.

The first receiver 101, the first processor 102 and the first transmitter 103 included in the apparatus for data transmission in the present invention may further have the following functions:

a first processor 102, configured to determine a first precoding matrix according to the RI and the first PMI; determining a second precoding matrix group according to the first precoding matrix and each phase difference in the phase difference set; determining a precoding matrix group of data to be transmitted of the UE according to the first precoding matrix and the second precoding matrix group, wherein the phase difference set is used for storing the phase difference between the two groups of polarized antennas; alternatively, the first and second electrodes may be,

the first processor 102 is configured to receive a second PMI transmitted by the UE, where the second PMI includes an indication of column vector selection; determining a first precoding matrix according to the RI and the first PMI; determining a second precoding matrix group based on the column vector determined by the indication of column vector selection and each phase difference in the set of phase differences; and determining a precoding matrix group of the data to be transmitted of the UE according to the first precoding matrix and the second precoding matrix group, wherein the phase difference set is used for storing the phase difference between the two groups of polarized antennas.

Optionally, the first precoding matrix is

Wherein, W₁Is N_tX 2M matrix, N_tThe number of antenna ports included for eNB, X being composed of a plurality of column vectors

M is the number of column vectors included in X.

Optionally, the first processor 102 is configured to select a precoding matrix from the precoding matrix group according to a predefined selection order according to a transmission order of the data to be transmitted in the frequency domain and the time domain.

Optionally, the precoding matrix W included in the precoding matrix group is ═ V₀ … V_R-1]Each column ofThe vector has the following structure

Wherein, V_iIs N_tA column vector of x 1, and,

is a plurality of modulo 1 and

values belonging to 1, -1, j, -j, N_tThe number of antenna ports included in eNB, R is the rank of the data channel included in RI, v_iIs a column vector in a diagonal block matrix X in the first precoding matrix determined according to the first PMI.

Optionally, the RI includes a rank of the data channel;

a first processor 102, configured to determine, according to a rank of a data channel, a number of ports of a demodulation reference symbol, DMRS, of the data channel, the number of ports of the DMRS being an even number greater than or equal to the rank of the data channel.

Optionally, the first processor 102 is configured to determine, according to the selected precoding matrix, a weighting matrix for the DMRS of the data channel, where each column vector in the weighting matrix for the DMRS may be represented as:

or

Optionally, in the RB, the different precoding matrices selected by the base station for the data to be transmitted include the same v₀～v_R-1，v_iAn indication of selection of a column vector in a second PMI in the selected precoding matrix, i being an integer greater than or equal to 0 and less than or equal to R-1;

within an RB, among different precoding matrices selected by the base station for the data to be transmitted

Is different from the prior art in that,

is the phase difference between the two sets of polarized antennas comprised by the second PMI in the selected precoding matrix.

Optionally, the first transmitter 103 is configured to send first configuration information or second configuration information to the UE, where the first configuration information is used to indicate that the UE only feeds back the RI and the first PMI when feeding back the channel state information to the eNB, and the second configuration information is used to indicate that the UE feeds back an indication of column vector selection among the RI, the first PMI, and the second PMI when feeding back the channel state information to the eNB.

Optionally, the first configuration information or the second configuration information is further used to instruct the UE to feed back a channel quality index CQI when feeding back the channel state information to the eNB;

a first receiver 101, configured to receive a CQI of a data channel sent by the UE according to the first configuration information or the second configuration information;

a first processor 102, configured to divide data to be transmitted into a plurality of data blocks according to the CQI; and weighting each data block in the plurality of data blocks through the selected precoding matrix and transmitting the data blocks to the UE.

Referring to fig. 2, fig. 2 is a block diagram of a data transmission device according to an embodiment of the present invention, the data transmission device may have a relatively large difference due to different configurations or performances, and may include one or more second receivers 201, a second processor 202, and a second reflector 203.

A second receiver 201, configured to receive a rank indication RI of a data channel sent by a user equipment UE;

a second processor 202, configured to determine, according to the RI, a precoding matrix group of data to be transmitted of the UE; transmitting the pre-coding matrix group to UE (user equipment) so that the UE decodes data to be transmitted according to the pre-coding matrix group, wherein the pre-coding matrix group comprises a plurality of pre-coding matrixes;

the second processor 202 is further configured to select a precoding matrix from the precoding matrix group according to a transmission sequence of data to be transmitted in a frequency domain and a time domain, and select different precoding matrices in the precoding matrix group when the data to be transmitted exists at least at two resource element RE positions in one resource block RB where the data to be transmitted is transmitted;

and the second transmitter 203 is configured to perform weighting processing on data to be transmitted through the selected precoding matrix, and then transmit the data to the UE.

Optionally, the data transmission device may include other components besides the second receiver 201, the second processor 202 and the second transmitter 203. For example, a second memory 204, one or more second storage media 207 (e.g., one or more mass storage devices) storing a second application 205 or second data 206 may also be included. Wherein the second memory 104 and the second storage medium 207 may be transient storage or persistent storage. The program stored in the second storage medium 207 may include one or more modules (not shown), each of which may include a series of instruction operations in a data transmission apparatus. Further, the second processor 202202 may be configured to communicate with the second storage medium 207 to execute a series of instruction operations in the second storage medium 207 on a data transfer device.

The means for data transfer may also include one or more second power supplies 208, one or more second wired or wireless network interfaces 209, one or more second input-output interfaces 210, one or more second keyboards 211, and/or one or more second operating systems 212, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, and the like.

The second receiver 201, the second processor 202202 and the second transmitter 203 included in the apparatus for data transmission in the present invention may further have the following functions:

the second transmitter 203 is further configured to issue the precoding matrix group to the UE through radio resource control RRC signaling.

Optionally, the second transmitter 203 is further configured to send third configuration information to the UE, where the third configuration information is used to instruct the UE to only feed back the RI when feeding back the channel state information to the eNB.

Optionally, the third configuration information is further used to instruct the UE to feed back a channel quality index CQI when feeding back the channel state information to the eNB;

a second receiver 201, configured to receive a CQI of a data channel sent by the UE according to the third configuration information;

the second transmitter 203 is further configured to divide the data to be transmitted into a plurality of data blocks according to the CQI; and weighting each data block in the plurality of data blocks through the selected precoding matrix and transmitting the data blocks to the UE.

Referring to fig. 3, fig. 3 is a block diagram of a data transmission device according to an embodiment of the present invention, which may have a relatively large difference due to different configurations or performances, and may include one or more third receivers 301, a third processor 302, and a third reflector 303.

A third receiver 301, configured to receive a channel state information reference symbol CSI-RS sent by a base station eNB;

a third processor 302 for determining a rank and a first precoding matrix of a data channel according to the CSI-RS;

a third transmitter 303, configured to send a rank indication and a first precoding matrix indication PMI to the eNB, where the rank indication includes RI, and the first PMI includes a first precoding matrix, so that the eNB determines a precoding matrix group according to the rank and the first precoding matrix, selects a precoding matrix from the precoding matrix group, performs weighting processing on data to be transmitted of the UE through the selected precoding matrix, and transmits the data to the UE;

the third receiver 301 is further configured to receive transmission data after weighting processing sent by the eNB;

a third processor 302, configured to determine a selected precoding matrix according to a transmission order of the transmission data in the frequency domain and the time domain;

the third processor 302 is further configured to demodulate the weighted transmission data with the selected precoding matrix.

Optionally, the data transmission device may include other components besides the third receiver 301, the third processor 302 and the third transmitter 303. For example, a third memory 304, one or more third storage media 307 (e.g., one or more mass storage devices) storing a third application 305 or third data 306 may also be included. Wherein the third memory 304 and the third storage medium 307 may be transient storage or persistent storage. The program stored in the third storage medium 307 may include one or more modules (not shown), each of which may include a series of instruction operations in a data transmission apparatus. Still further, the third processor 302302 may be configured to communicate with the third storage medium 307 to execute a series of instruction operations in the third storage medium 307 on a data transfer device.

The means for data transmission may also include one or more third power supplies 308, one or more third wired or wireless network interfaces 309, one or more third input-output interfaces 310, one or more third keyboards 311, and/or one or more third operating systems 312, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, and the like.

The third receiver 301, the third processor 302302 and the third transmitter 303 included in the apparatus for data transmission in the present invention may further have the following functions:

a third processor 302, configured to determine a precoding matrix group according to the RI and the first PMI; selecting a precoding matrix from a precoding matrix group according to the transmission sequence of the transmission data in the frequency domain and the time domain; alternatively, the first and second electrodes may be,

the third processor 302 is further configured to receive a precoding matrix group sent by the eNB, and select a precoding matrix from the precoding matrix group according to a transmission order of transmission data in a frequency domain and a time domain.

Optionally, the third receiver 301 is further configured to receive first configuration information sent by the eNB, where the first configuration information is used to instruct the UE to only feed back the RI and the first PMI when feeding back the channel state information to the eNB;

the third processor 302 is further configured to determine a rank and a first precoding matrix of the data channel according to the first configuration information and the CSI-RS.

Optionally, the third processor 302 is further configured to determine an indication of column vector selection in the second PMI;

a third transmitter 303, configured to transmit a second PMI to the eNB, the second PMI including an indication of the column vector selection, so that the eNB determines the precoding matrix group according to the RI, the first PMI, and the indication of the column vector selection.

Optionally, the third receiver 301 is further configured to receive second configuration information sent by the eNB, where the second configuration information is used to indicate that the UE feeds back an indication of column vector selection among the RI, the first PMI, and the second PMI when feeding back the channel state information to the eNB;

the third processor 302 is further configured to determine an indication of column vector selection in the second PMI according to the second configuration information.

a third processor 302, configured to calculate a CQI of a data channel when a precoding matrix is selected from a precoding matrix group according to a predefined selection order according to an order of a frequency domain and a time domain of transmission data;

the third transmitter 303 is further configured to transmit the CQI to the eNB according to the first configuration information or the second configuration information.

Optionally, the precoding matrix W included in the precoding matrix group is ═ V₀ … V_R-1]Each column vector of (1) has the following constitution

Wherein, V_iIs N_tA column vector of x 1, and,

is a plurality of modulo 1 and

values belonging to 1, -1, j, -j, N_tThe number of antenna ports included by the eNB is, R is a rank of a data channel included by the RI, and vi is a column vector in a diagonal block matrix X in the first precoding matrix determined according to the first PMI.

Is different from the prior art in that,

Optionally, the number of CQIs is independent of the rank of the data channel.

Optionally, the third processor is further configured to determine, according to the rank of the data channel, the number of ports of a demodulation reference symbol DMRS of the data channel, where the number of ports of the DMRS is an even number greater than or equal to the rank of the data channel.

Referring to fig. 4, fig. 4 is a block diagram of a data transmission device according to an embodiment of the present invention, which may have a relatively large difference due to different configurations or performances, and may include one or more fourth receivers 401, a fourth processor 402, and a fourth reflector 403.

A fourth receiver 401, configured to receive a channel state information reference symbol CSI-RS sent by a base station eNB;

a fourth processor 402 for determining a rank of the data channel according to the CSI-RS;

a fourth transmitter 403, configured to send a rank indication RI to the base station eNB, where the RI includes a rank of a data channel, so that the eNB determines a precoding matrix group according to the rank, selects a precoding matrix from the precoding matrix group, and transmits the UE after performing weighting processing on data to be transmitted of the UE through the selected precoding matrix;

the fourth receiver 401 is further configured to receive the precoding matrix group and the weighted transmission data sent by the eNB;

a fourth processor 402, configured to select a precoding matrix from the precoding matrix group according to a transmission order of the transmission data in the frequency domain and the time domain;

the fourth processor 402 is further configured to demodulate the weighted transmission data with the selected precoding matrix.

Optionally, the data transmission apparatus may include other components besides the fourth receiver 401, the fourth processor 402 and the fourth transmitter 403. For example, a fourth memory 404, one or more fourth storage media 407 (e.g., one or more mass storage devices) storing a fourth application 405 or fourth data 406 may also be included. Wherein the fourth memory 404 and the fourth storage medium 407 may be transient storage or persistent storage. The program stored in the fourth storage medium 407 may include one or more modules (not shown), each of which may include a series of instruction operations in a data transmission apparatus. Still further, the fourth processor 402 may be configured to communicate with the fourth storage medium 407, and execute a series of instruction operations in the fourth storage medium 407 on the data transmission apparatus.

The means for data transmission may also include one or more fourth power supplies 408, one or more fourth wired or wireless network interfaces 409, one or more fourth input-output interfaces 410, one or more fourth keyboards 411, and/or one or more fourth operating systems 412, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, etc.

The fourth receiver 401, the fourth processor 402 and the fourth transmitter 403 included in the apparatus for data transmission in the present invention may further have the following functions:

optionally, the fourth receiver 401 further receives third configuration information sent by the eNB, where the third configuration information is used to instruct the UE to only feed back the RI when feeding back the channel state information to the eNB;

the fourth processor 402 is further configured to determine a rank of the data channel according to the third configuration information and the CSI-RS.

Optionally, the third configuration information is further used to instruct the UE to feed back the channel quality index CQI when feeding back the channel state information to the eNB

A fourth processor 402, configured to calculate a CQI of the data channel when assuming that a precoding matrix is selected from the precoding matrix group according to a predefined selection order according to an order of a frequency domain and a time domain of transmission data;

a fourth transmitter 403, configured to transmit CQI to the eNB according to the third configuration information.

Referring to fig. 5, fig. 5 is a data transmission apparatus according to an embodiment of the present invention, where the apparatus includes:

a first receiving module 501, configured to receive a rank indication RI of a data channel sent by a user equipment UE, where a first precoding matrix indicates a PMI;

a first determining module 502, configured to determine, according to the RI and the first PMI, a precoding matrix group of data to be transmitted of the UE, where the precoding matrix group includes multiple precoding matrices;

a first selecting module 503, configured to select a precoding matrix from a precoding matrix group according to a transmission sequence of data to be transmitted in a frequency domain and a time domain, and select different precoding matrices in the precoding matrix group when the data to be transmitted exists at least at two resource element RE positions in one resource block RB where the data to be transmitted is transmitted;

and a first transmission module 504, configured to perform weighting processing on data to be transmitted through the selected precoding matrix, and transmit the data to the UE.

Optionally, the first determining module 502 includes:

a third determining unit, configured to determine, according to the first precoding matrix and the second precoding matrix group, a precoding matrix group of data to be transmitted of the UE; alternatively, the first and second electrodes may be,

a first determining module 502, comprising:

a fourth determining unit, configured to determine the first precoding matrix according to the RI and the first PMI;

a fifth determining unit, configured to determine a second precoding matrix group according to the column vector determined by the indication of the column vector selection and each phase difference in a phase difference set, where the phase difference set is used to store phase differences between two groups of polarized antennas;

Optionally, the first precoding matrix is

M is the number of column vectors included in X.

Optionally, the first selecting module 503 includes:

and the first selection unit is used for selecting the precoding matrix from the precoding matrix group according to the transmission sequence of the data to be transmitted in the frequency domain and the time domain and according to the predefined selection sequence.

Wherein, V_iIs N_tA column vector of x 1, and,

is a complex of mode 1Number and

Optionally, the RI includes a rank of the data channel;

the device still includes:

and the second determining module is used for determining the number of ports of a demodulation reference symbol (DMRS) of the data channel according to the rank of the data channel, wherein the number of the ports of the DMRS is an even number which is greater than or equal to the rank of the data channel.

Optionally, the apparatus further comprises:

or

Is different from the prior art in that,

two for the second PMI in the selected precoding matrixPhase differences between the group polarized antennas.

Optionally, the apparatus further comprises:

the first sending module is used for sending first configuration information or second configuration information to the UE, the first configuration information is used for indicating that the UE only feeds back the RI and the first PMI when feeding back the channel state information to the eNB, and the second configuration information is used for indicating that the UE feeds back the indication of column vector selection in the RI, the first PMI and the second PMI when feeding back the channel state information to the eNB.

the device still includes:

a first receiving module 501, configured to receive a CQI of a data channel sent by the UE according to the first configuration information or the second configuration information;

a first transmission module 504 comprising:

the first dividing unit is used for dividing the data to be transmitted into a plurality of data blocks according to the CQI;

Referring to fig. 6, fig. 6 is a data transmission apparatus according to an embodiment of the present invention, where the apparatus includes:

a second receiving module 601, configured to receive a rank indication RI of a data channel sent by a user equipment UE;

a fourth determining module 602, configured to determine, according to the RI, a precoding matrix group of data to be transmitted of the UE;

a second transmission module 603, configured to transmit the precoding matrix group to the UE, so that the UE decodes data to be transmitted according to the precoding matrix group, where the precoding matrix group includes multiple precoding matrices;

a second selecting module 604, configured to select a precoding matrix from the precoding matrix group according to a transmission sequence of data to be transmitted in a frequency domain and a time domain, and select different precoding matrices in the precoding matrix group when the data to be transmitted exists at least at two resource element RE positions in one resource block RB where the data to be transmitted is transmitted;

a third transmission module 605, configured to perform weighting processing on the data to be transmitted through the selected precoding matrix, and transmit the data to the UE.

Optionally, the second transmission module 603 is configured to issue a precoding matrix group to the UE through a radio resource control RRC signaling.

Optionally, the apparatus further comprises:

and a second sending module, configured to send third configuration information to the UE, where the third configuration information is used to instruct the UE to only feed back the RI when feeding back the channel state information to the eNB.

the device still includes:

a third transmission module 605 comprising:

the second dividing unit is used for dividing the data to be transmitted into a plurality of data blocks according to the CQI;

and the second transmission unit is used for performing weighting processing on each data block in the plurality of data blocks through the selected precoding matrix and then transmitting the data blocks to the UE.

Referring to fig. 7, fig. 7 is a data transmission apparatus according to an embodiment of the present invention, where the apparatus includes:

a fourth receiving module 701, configured to receive a channel state information reference symbol CSI-RS sent by a base station eNB;

a fifth determining module 702, configured to determine a rank and a first precoding matrix of a data channel according to the CSI-RS;

a third sending module 703, configured to send a rank indication and a first precoding matrix indication PMI to the eNB, where the rank indication includes RI, and the first PMI includes a first precoding matrix, so that the eNB determines a precoding matrix group according to the rank and the first precoding matrix and selects a precoding matrix from the precoding matrix group, and transmits the data to be transmitted of the UE to the UE after performing weighting processing on the data to be transmitted of the UE through the selected precoding matrix;

a fourth receiving module 701, configured to receive transmission data after weighting processing and sent by an eNB;

a sixth determining module 704, configured to determine the selected precoding matrix according to a transmission order of the transmission data in the frequency domain and the time domain;

a first demodulation module 705, configured to demodulate the weighted transmission data with the selected precoding matrix.

Optionally, the sixth determining module 704 includes:

a second selecting unit, configured to select a precoding matrix from the precoding matrix group according to a transmission order of the transmission data in the frequency domain and the time domain; alternatively, the first and second electrodes may be,

a sixth determining module 704, comprising:

a second receiving unit, configured to receive a precoding matrix group sent by an eNB;

and a third selecting unit, configured to select a precoding matrix from the precoding matrix group according to a transmission order of the transmission data in the frequency domain and the time domain.

Optionally, the apparatus further comprises:

a fifth receiving module, configured to receive first configuration information sent by the eNB, where the first configuration information is used to instruct the UE to only feed back the RI and the first PMI when feeding back the channel state information to the eNB;

a fifth determining module 702, configured to determine a rank and a first precoding matrix of the data channel according to the first configuration information and the CSI-RS.

Optionally, the apparatus further comprises:

a seventh determining module for determining an indication of column vector selection in the second PMI;

and the fourth sending module is configured to send a second PMI to the eNB, where the second PMI includes an indication of column vector selection, so that the eNB determines the precoding matrix group according to the RI, the first PMI, and the indication of column vector selection.

Optionally, the apparatus further comprises:

a seventh determining module, configured to determine, according to the second configuration information, an indication of column vector selection in the second PMI.

the device still includes:

a first calculation module, configured to calculate a CQI of a data channel when a precoding matrix is selected from a precoding matrix group according to a predefined selection order based on an order of a frequency domain and a time domain of transmission data;

and a fifth sending module, configured to send the CQI to the eNB according to the first configuration information or the second configuration information.

Optionally, the precoding matrix W included in the precoding matrix group is ═ V₀ … V_R-1]Each column vector ofHas the following constitution

Wherein, V_iIs N_tA column vector of x 1, and,

is a plurality of modulo 1 and

Is different from the prior art in that,

Optionally, the number of CQIs is independent of the rank of the data channel.

Optionally, the apparatus further comprises:

and the eighth determining module is used for determining the number of ports of a demodulation reference symbol (DMRS) of the data channel according to the rank of the data channel, wherein the number of the ports of the DMRS is an even number which is greater than or equal to the rank of the data channel.

Referring to fig. 8, fig. 8 is a data transmission apparatus according to an embodiment of the present invention, where the apparatus includes:

a seventh receiving module 801, configured to receive a channel state information reference symbol CSI-RS sent by a base station eNB;

a ninth determining module 802, configured to determine a rank of the data channel according to the CSI-RS;

a sixth sending module 803, configured to send a rank indication RI to the base station eNB, where the RI includes a rank of a data channel, so that the eNB determines a precoding matrix group according to the rank and selects a precoding matrix from the precoding matrix group, and transmits the data to be transmitted of the UE to the UE after performing weighting processing on the data to be transmitted of the UE through the selected precoding matrix;

a seventh receiving module 801, configured to receive the precoding matrix group and the transmission data after the weighting processing sent by the eNB;

a tenth determining module 804, configured to select a precoding matrix from the precoding matrix group according to a transmission order of the transmission data in the frequency domain and the time domain;

a second demodulation module 805, configured to demodulate the weighted transmission data with the selected precoding matrix.

Optionally, the apparatus further comprises:

an eighth receiving module, configured to receive third configuration information sent by the eNB, where the third configuration information is used to instruct the UE to only feed back the RI when feeding back the channel state information to the eNB;

a ninth determining module 802, configured to determine a rank of the data channel according to the third configuration information and the CSI-RS.

The device still includes:

a second calculating module, configured to calculate a CQI of a data channel when a precoding matrix is selected from a precoding matrix group according to a predefined selection order based on an order of a frequency domain and a time domain of transmission data;

and a seventh sending module, configured to send the CQI to the eNB according to the third configuration information.

An embodiment of the present invention provides a data transmission method, which is applied to an eNB, see fig. 9, where the method includes:

step 901: a base station eNB receives rank indication RI of a data channel sent by a user terminal UE, a first precoding matrix indication PMI, and determines a precoding matrix group of data to be transmitted of the UE according to the RI and the first PMI, wherein the precoding matrix group comprises a plurality of precoding matrices;

step 902: selecting a precoding matrix from a precoding matrix group according to the transmission sequence of data to be transmitted in a frequency domain and a time domain, and selecting different precoding matrices in the precoding matrix group when the data to be transmitted exists at least at two resource element RE positions in a resource block RB for transmitting the data to be transmitted;

step 903: and carrying out weighting processing on the data to be transmitted through the selected precoding matrix and then transmitting the data to the UE.

An embodiment of the present invention provides a data transmission method, which is applied to an eNB, see fig. 10, where the method includes:

step 1001: a base station eNB receives rank indication RI of a data channel sent by user equipment UE, determines a pre-coding matrix group of data to be transmitted of the UE according to the RI, and transmits the pre-coding matrix group to the UE so that the UE decodes the data to be transmitted according to the pre-coding matrix group, wherein the pre-coding matrix group comprises a plurality of pre-coding matrixes;

step 1002: selecting a precoding matrix from a precoding matrix group according to the transmission sequence of data to be transmitted in a frequency domain and a time domain, and selecting different precoding matrices in the precoding matrix group when the data to be transmitted exists at least at two resource element RE positions in a resource block RB for transmitting the data to be transmitted;

step 1003: and carrying out weighting processing on the data to be transmitted through the selected precoding matrix and then transmitting the data to the UE.

An embodiment of the present invention provides a data transmission method, which is applied to a UE, and refer to fig. 11, where the method includes:

step 1101: the user terminal UE determines the rank of a data channel and a first precoding matrix according to a channel state information reference symbol CSI-RS issued by a base station eNB;

step 1102: sending a rank indication (PMI) and a first Precoding Matrix Indication (PMI) to an eNB, wherein the rank indication comprises RI, and the first PMI comprises a first precoding matrix, so that the eNB determines a precoding matrix group according to the rank and the first precoding matrix and selects the precoding matrix from the precoding matrix group, and the data to be transmitted of the UE is weighted by the selected precoding matrix and then transmitted to the UE;

step 1103: and receiving the weighted transmission data issued by the eNB, determining a selected precoding matrix according to the transmission sequence of the transmission data in the frequency domain and the time domain, and demodulating the weighted transmission data through the selected precoding matrix.

An embodiment of the present invention provides a data transmission method, which is applied to a UE, and refer to fig. 12, where the method includes:

step 1201: a user terminal UE receives a channel state information reference symbol CSI-RS issued by a base station eNB, and determines the rank of a data channel according to the CSI-RS;

step 1202: sending Rank Indication (RI) to a base station eNB, wherein the RI comprises the rank of a data channel, so that the eNB determines a precoding matrix group according to the rank and selects a precoding matrix from the precoding matrix group, and the selected precoding matrix is used for carrying out weighting processing on data to be transmitted of the UE and then transmitting the data to the UE;

step 1203: and receiving the precoding matrix group and the weighted transmission data sent by the eNB, selecting a precoding matrix from the precoding matrix group according to the transmission sequence of the transmission data in the frequency domain and the time domain, and demodulating the weighted transmission data through the selected precoding matrix.

An embodiment of the present invention provides a data transmission method, which is applied between an eNB and a UE, see fig. 13-1, where the method includes:

step 1301: the eNB transmits the CSI-RS to the UE.

In a MIMO wireless communication system, data diversity and array gain are obtained through precoding processing, and a signal vector received by a UE after precoding processing can be represented by the following formula (1):

Y＝HWs+n (1)

wherein Y represents a received signal vector; h denotes a data channel matrix; w denotes a precoding matrix, s denotes a transmitted symbol vector, and n denotes measurement noise.

Optimal precoding usually requires that a transmitter of the eNB completely knows Channel State Information (CSI), so that the eNB sends CSI-RS to the UE before transmitting data to the UE, and the CSI-RS is used for the UE to measure and report current CSI.

Wherein The CSI includes a previous one, a previous two, a previous three, or a previous four of a Rank Indication (RI) of The data Channel, The First Precoding Matrix Index (PMI 1), The Second Precoding Matrix Index (PMI 2), and a Channel Quality Index (CQI).

RI indicates the number of layers used for antennas, PMI1 corresponds to the first precoding matrix W1, PMI2 corresponds to the second precoding matrix W2, W1 and W2 are used to construct the precoding matrix W, and W is obtained by multiplying W1 and W2 as shown in the following equation (2):

W＝W1×W2 (2)

w1 is a first precoding matrix characterized by a block diagonal matrix, each sub-block corresponding to a polarization direction, as shown in equation (3) below:

wherein X^(k)Representing a selected kth group of vectors in the first precoding matrix. For different ranks of data channels, X^(k)And W₂There are different manifestations.

When RANK 1 or RANK2 of the data channel, the set of vectors is defined as:

B＝[b₀ b₁ … b₃₁]，

the vector set is divided into 16 vector groups of 4 column vectors each, two columns of two adjacent vector groups being overlapping. X^(k)Representing the kth vector set.

X^(k)∈{[b_2kmod32 b_(2k+1)mod32 b_(2k+2)mod32 b_(2k+3)mod32]：k＝0，1，…，15} (4)

When RANK is 1, W₂From second-level codebooks, i.e.

Wherein

When RANK is 2, W₂From second-level codebooks, i.e.

Wherein

The representation is a column vector selection indication, the nth element of which is 1, and the rest elements are 0;

when RANK is 3 or RACK is 4: the set of vectors is defined as

B＝[b₀ b₁ … b₁₅]，

The vector set is divided into 4 vector groups of 8 column vectors each, and four column vectors of two adjacent vector groups are overlapping. X^(k)Representing the kth vector set.

X^(k)∈{[b_4kmod16 b_(4k+1)mod16 … b_(4k+7)mod16]：k＝0，1，2，3} (8)

When RANK is 3, W₂Can be selected from

Wherein the content of the first and second substances,

when RANK is 4, W₂Can be selected from

Wherein the content of the first and second substances,

Y∈{[e₁ e₅]，[e₂ e₆]，[e₃ e₇]，[e₄ e₈]} (12)

the first precoding matrix is applicable to the entire system bandwidth and has a long period characteristic. The second precoding matrix reflects a matrix for each subband that functions to select a column vector for each subband and to select the phase difference (co-phase) between the two sets of polarization directions.

With the application of two-dimensional (2D) antenna technology, the codebook design of 2D morphology has also become a hot point of research. In the current discussion of the LTE standard, a codebook in the form of KP (Kronecker product) is recognized by a number of participating companies, namely W₁The block diagonal matrix of (1) is composed of a vector in the horizontal direction and a vector in the vertical direction by KP

Wherein the content of the first and second substances,

represented as the k-th vector set in the horizontal direction,

denoted as the ith vector set in the vertical direction.

Fig. 13-2 shows a schematic diagram of the first precoding matrix in the case of RANK 1 and RANK2 in the 2D vector set. Wherein 32 column vectors in the horizontal direction form a horizontal direction vector set, 8 column vectors in the vertical direction form a vertical direction vector set, wherein b_m，nRepresenting the kronecker product of the nth column vector in the horizontal direction and the mth column vector in the vertical direction. It is assumed that a vector set is generated by KP from 4 horizontal column vectors and 2 vertical column vectors, i.e. 8 column vectors are included.

Step 1302: and the UE receives the CSI-RS sent by the eNB, measures the rank and the first precoding matrix of the data channel, and sends the RI and the first PMI to the eNB.

The RI includes rank of data channel, the first PMI includes a first precoding matrix, the first precoding matrix is

Of the matrix of (a).

Before this step, the eNB sends configuration information to the UE, where the configuration information may be first configuration information or second configuration information, and the first configuration information is used to instruct the UE to only feed back the RI and the first PMI when feeding back the channel state information to the eNB; the second configuration information is used for indicating the UE to feed back an indication of column vector selection among the RI, the first PMI and the second PMI when feeding back the channel state information to the eNB.

The first configuration information and the second configuration information are further used for instructing the UE to feed back CQI of the data channel when feeding back the channel state information to the eNB.

If the eNB sends the first configuration information to the UE, this step may be:

and the UE measures the rank and the CQI of the data channel and the first precoding matrix according to the first configuration information, and sends the RI, the CQI and the first PMI to the eNB.

If the eNB sends the second configuration information to the UE, this step may be:

the UE measures the rank and CQI of a data channel and the indication of column vector selection in the first precoding matrix and the second precoding matrix according to the second configuration information; and transmitting the rank and the CQI of the data channel and an indication of the selection of the column vector in the first precoding matrix and the second precoding matrix to the eNB.

eNB defines a set of column vectors v₀，…，v_mAfter the UE receives the CSI-RS, the UE selects one or more column vectors suitable for the UE from the set of column vectors, and calculates rank and CQI of the data channel assuming that each of the one or more column vectors and each phase difference in the set of phase differences are used alternately between Resource Blocks (RBs) or RB groups.

It should be noted that, because each column vector and each phase difference are used alternately between RBs or RB groups, data of each layer of the antenna has the same channel quality, that is, only one CQI corresponds to each layer regardless of the value of RI, and therefore, the number of CQIs is independent of the rank of the data channel.

Step 1303: and the eNB receives the RI and the first PMI sent by the UE, and determines a precoding matrix group of data to be transmitted of the UE according to the RI and the first PMI.

Specifically, a first precoding matrix is determined according to the RI and the first PMI, a second precoding matrix group is determined according to the first precoding matrix and each phase difference in the phase difference set, and a precoding matrix group of the data to be transmitted of the UE is determined according to the first precoding matrix and the second precoding matrix group.

If the UE also sends an indication of column vector selection in the second PMI to the eNB in step 1302, this step may be:

receiving an indication of column vector selection in a second PMI transmitted by the UE, determining a first precoding matrix according to the RI and the first PMI, determining a second precoding matrix group according to the indication of column vector selection and each phase difference in a phase difference set, and determining a precoding matrix group of data to be transmitted of the UE according to the first precoding matrix and the second precoding matrix group.

The precoding matrix group comprises a plurality of precoding matrixes, and the precoding matrix W ═ V contained in the precoding matrix group₀ … V_R-1]Each column vector of (1) has the following constitution

Wherein, V_iIs N_tA column vector of x 1, and,

is a plurality of modulo 1 and

values belonging to 1, -1, j, -j, N_tThe number of antenna ports included in eNB, R is the rank of the data channel included in RI, v_iIs a column vector in the diagonal block matrix X in the first precoding matrix determined from the first PMI 1.

For example, when the rank of the data channel is 1 or 2, W1 of W1 indicated by the first PMI is as shown in the following formula (14):

the diagonal matrix X of W1 includes 4 column vectors, v0, v1, v2 and v 3. The two diagonal matrices represent two sets of antenna ports for the polarization directions. The UE selects W1, and then uses the column vector of the diagonal matrix X in W1 and the phase difference in the phase difference set in turn when calculating CQI and RI, that is, the column vector of the diagonal matrix X in W1 is used in turn between WB or RB groups, and the phase difference in the phase difference set is cyclically used between two sets of polarization directions within an RB or RB group, and the phase difference set can be phi_{l，l＝0，1，2，}3＝{1，j，-1，-j}。

When RANK is 1, the precoding matrix on the k-th subcarrier is

Where l ═ mod (k, 4), e_n＝[0，0，…，1，…，0]^TA 4 × 1 column vector with the nth element being 1 and the remaining elements being 0, l — mod (m, 4); the matrix a is a constant matrix.

When RANK is equal to 1, the data is transmitted,

where k denotes the index of a subcarrier or a group of subcarriers and Γ denotes a constant. Or A is represented as a weighting matrix of SFBC, and the data of the 2 m-th subcarrier is weighted in the manner of

The data weighting method of the 2m +1 th subcarrier is

When RANK is 2, the precoding matrix on the k-th subcarrier is

When the RANK is 2, the RANK is set to 2,

k denotes an index of a subcarrier or RB, and Γ denotes a constant or a constant matrix.

When RANK is 3, a column vector and a pair of orthogonal phase differences can only constitute precoded column vectors of 2 layers, and thus a vector orthogonal to it is required to constitute a precoded vector of another layer, and thus W1 becomes a precoding vector of another layer

Wherein (v)₀，v₄)，(v₁，v₅)，(v₂，v₆)，(v₃，v₇) Form orthogonal vector pairs, W2 has the following form

One set of vector pairs is used in turn per RB or group of RBs. E.g., the first RB or group of RBs, using vector pairs (v)₀，v₄) Using in turn the W2 matrix on each subcarrier of an RB or RB group

And

and the column switching matrix, i.e. the subcarrier, of each matrixW2 used alternately between waves is

Therefore, for a certain subcarrier in an RB or RB group, the precoding matrix is

When RANK is 3, the representation of matrix a is of the form:

w1 has the same form when RANK is 4, W1 thereof is the same as when RANK is 3, but for W2, is selected from the following matrix group

And the column switching matrix of each matrix, i.e. W2 used alternately between subcarriers, is

When RANK is 4, the representation of matrix a is of the form:

when RANK is 5, W1 has the following form

Wherein the vector v₀，v₁，v₂，v₃Are vectors that are mutually orthogonal to each other. At this time W2 is a fixed matrix. Therefore, in this transmission mode, it is only necessary to perform column permutation on W2. I.e. in the case of RANK 5

W_alterIs to perform column switching on W2

When RANK is 5, the matrix a is represented in the form of

When RANK is 6

W_alterIs to perform column switching on W2

When RANK is 6, the matrix a is represented in the form of

When RANK is 7

W_alterIs to perform column switching on W2

When RANK is 7, the matrix a is represented in the form of

When RANK is 8

W_alterIs to perform column switching on W2

When RANK is 8, the matrix a is represented in the form of

Further, according to the rank of the data channel, the number of ports of the DMRS of the data channel may also be determined, the number of ports of the DMRS being an even number greater than or equal to the rank of the data channel.

The eNB may store the correspondence between the rank and the number of ports, and correspondingly, this step may be: and acquiring the port number of the DMRS of the data channel from the corresponding relation between the rank and the port number according to the rank of the data channel.

The eNB may also calculate the number of ports of the DMRS of the data channel according to the following formula 15 directly according to the rank of the data channel without storing the correspondence between the rank and the number of ports.

P is the number of ports of the DMRS, R is the rank of the data channel,

to round the ratio of R/2.

For example, R ═ 1 or 2, then P is 2; r is 3 or 4, then P is 4; r is 5 or 6, then P is 6; r ═ 7 or 8, then P is 8; that is, in the embodiment of the present invention, P is always an even number.

Step 1304: and selecting a precoding matrix from the precoding matrix group according to the transmission sequence of the data to be transmitted in the frequency domain and the time domain.

Specifically, the precoding matrix is selected from the precoding matrix group according to a predefined selection order according to the transmission order of the data to be transmitted in the frequency domain and the time domain.

In this step, the RBs transmitting the data to be transmitted use the precoding matrices in the precoding matrix group in turn, so that different precoding matrices in the precoding matrix group are selected when there are at least two resource element RE positions transmitting the data to be transmitted in one resource block RB transmitting the data to be transmitted.

In RBIn addition, different precoding matrixes selected by the base station for the data to be transmitted contain the same v₀～v_R-1，v_iAn indication of selection of a column vector in a second PMI in the selected precoding matrix, i being an integer greater than or equal to 0 and less than or equal to R-1;

Is different from the prior art in that,

Further, according to the selected coding matrix, a weighting matrix for the DMRS of the data channel may also be determined, and each column vector in the weighting matrix for the DMRS may be represented as:

or

Assume that the transmitting end has 8 antenna ports, where antenna ports 1-4 belong to +45 polarization direction and antenna ports 5-8 belong to-45 polarization direction, as shown in fig. 13-3.

Antenna ports 0, 1, 2, 3 and a weighting matrix v pointing in a certain beam direction₀Form one DMRS port,

antenna ports

4, 5, 6, 7 and v₀Constitute another DMRS port. Similarly, antenna ports 0, 1, 2, 3 and weight matrix v pointing in a certain beam direction₁A third DMRS port,

antenna ports

4, 5, 6, 7 and v, may be formed₁A fourth DMRS port may be formed, where v₀v₁Is N_aX 1 weighting matrix, N_aThe number of antenna ports in one polarization direction. In the following, we express the weights of DMRS ports in the form of equations.

Suppose that the first DMRS port transmits a signal s₀In the form of a weight of

Similarly, the second DMRS port is

The third DMRS port is

The fourth DMRS port is

The fifth DMRS port is

Wherein the content of the first and second substances,

is 2N_aA x 1 weighting matrix.

For example, referring to fig. 13-4, the first precoding matrix W1 includes 4 column vectors, and the UE selects the column vectors from W1.

Step 1305: and carrying out weighting processing on the data to be transmitted through the selected precoding matrix and then transmitting the data to the UE.

Specifically, according to the CQI, data to be transmitted is divided into a plurality of data blocks; and weighting each data block in the plurality of data blocks through the selected precoding matrix and transmitting the data blocks to the UE.

And after weighting each data block through the selected precoding matrix, bearing each data block after weighting in a subcarrier in a data channel, and transmitting the subcarrier to the UE.

Step 906: and the UE receives the transmission data after weighting processing issued by the eNB, determines a selected precoding matrix according to the transmission sequence of the transmission data in the frequency domain and the time domain, and demodulates the transmission data after weighting processing through the selected precoding matrix.

The step of determining the selected precoding matrix according to the transmission sequence of the transmission data in the frequency domain and the time domain may be:

determining a selected precoding matrix group according to the RI and the first PMI, and selecting a precoding matrix from the precoding matrix group according to the transmission sequence of the transmission data in the frequency domain and the time domain; alternatively, the first and second electrodes may be,

and receiving the precoding matrix group sent by the eNB, and selecting a precoding matrix from the precoding matrix group according to the transmission sequence of the transmission data in the frequency domain and the time domain.

For the data channel, each data layer is data weighted. Suppose that the ith data stream is weighted in the manner of

Wherein d is_iFor data transmitted for the ith data layer, A represents a constant matrix, φ_lIndicating the phase difference between the two sets of antenna in the polarization directions. From this, we can see that the weighting matrix of the data layer can be generated by linear combination of the weighting matrices of the two DMRS ports, for example, the weighting matrix of the ith data layer can be expressed as

Therefore if A and φ_lThe transmission data of each layer of the data channel can be recovered by the DMRS port, if all are known.

Before this step, the UE further needs to determine, according to the rank of the data channel, the port number of the EMRS of the data channel, where the port number of the DMRS is an even number greater than or equal to the rank of the data channel.

The UE may store the correspondence between the rank and the number of ports, and correspondingly, this step may be: and acquiring the port number of the DMRS of the data channel from the corresponding relation between the rank and the port number according to the rank of the data channel.

The UE may also calculate the number of ports of the DMRS of the data channel according to the following formula 15 directly according to the rank of the data channel without storing the correspondence between the rank and the number of ports.

P is the number of ports of the DMRS, R is the rank of the data channel,

to round the ratio of R/2.

An embodiment of the present invention provides a method for transmitting data, where the method is applied between an eNB and a UE, and referring to fig. 14, the method includes:

step 1401: the eNB transmits the CSI-RS to the UE.

Step 1402: and the UE receives the CSI-RS sent by the eNB, acquires the rank of the data channel and transmits the RI to the eNB.

Before this step, the eNB sends third configuration information to the UE, where the third configuration information is used to indicate that the UE only feeds back the rank of the data channel when feeding back the channel state information to the eNB.

The third configuration information is further used to instruct the UE to feed back the CQI of the data channel when feeding back the channel state information to the eNB, and in this step, the UE may further obtain the CQI of the data channel according to the third configuration information and transmit the CQI of the data channel to the eNB.

Step 1403: and the eNB receives the RI sent by the UE, determines a precoding matrix group of the data to be transmitted of the UE according to the RI, and transmits the precoding matrix group to the UE.

The eNB may issue the precoding matrix set to the UE through radio resource control RRC signaling.

The eNB stores the correspondence between the rank and the precoding matrix group, and correspondingly, the step of determining the precoding matrix group of the data to be transmitted of the UE according to the RI may be:

and acquiring a precoding matrix group corresponding to the rank from the corresponding relation between the rank and the precoding matrix group according to the rank of the data channel included in the RI.

When RANK is 1, the precoding matrix on the mth RB or the kth subcarrier in the RB group is

Wherein e is_iIs N_aX 1 vector, the value of the ith element being 1 and the remaining values being 0, where N_aIs the number of port pairs. Where n ═ mod (k, 4) +1, l ═ mod (m, 2); a is a constant matrix. Using different phi in turn on different sub-carriers_{l，l＝0，1，2，3}0, pi/2, pi, 3 pi/2. Different port pairs are used cyclically between different RBs or RB groups.

When RANK is 2, the precoding matrix on the kth subcarrier in the mth RB or RB group is

Wherein e is_iIs N_aX 1 vector, the value of the ith element being 1 and the remaining values being 0, where N_aIs the number of port pairs. Where n ═ mod (k, 4) +1, l ═ mod (c)m，2)。

When RANK is 3, W2 is selected from the following 4 matrices

Used on each sub-carrier in each RB or RB group in turn

And

When RANK is 4, W1 has the same form as W1 of RANK 3, but for W2, it is selected from the following matrix group

On each subcarrier of an RB or RB group, using in turn W2 matrix

Step 1404: and the UE receives the precoding matrix group transmitted by the eNB and stores the precoding matrix group.

Step 1405: and the eNB selects a precoding matrix from the precoding matrix group according to the transmission sequence of the data to be transmitted in the frequency domain and the time domain.

Selecting different precoding matrixes in a precoding matrix group when the data to be transmitted exists at least at two resource element RE positions in a resource block RB for transmitting the data to be transmitted;

step 1406: and the eNB performs weighting processing on the data to be transmitted through the selected precoding matrix and transmits the data to the UE.

Step 1407: and the UE receives the transmission data which are transmitted by the eNB and subjected to weighting processing, determines a selected precoding matrix according to the transmission sequence of the transmission data in the frequency domain and the time domain, and demodulates the transmission data which are subjected to weighting processing through the selected precoding matrix.

Specifically, a precoding matrix is selected from a precoding matrix group according to a transmission order of transmission data in a frequency domain and a time domain.

It should be noted that: in the data transmission apparatus provided in the foregoing embodiment, only the division of the functional modules is illustrated when data is clustered for data transmission, and in practical applications, the function distribution may be completed by different functional modules according to needs, that is, the internal structure of the apparatus is divided into different functional modules to complete all or part of the functions described above. In addition, the data transmission-based apparatus provided in the above embodiments and the data transmission method embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments and are not described herein again.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A method of data transmission, the method comprising:

2. The method of claim 1, wherein the determining a precoding matrix set of data to be transmitted for the UE according to the RI and the first PMI comprises:

3. The method according to any of claims 1-2, wherein the selecting a precoding matrix from the precoding matrix group according to the transmission order of the data to be transmitted in the frequency domain and the time domain comprises:

4. The method according to any one of claims 1-2,

a precoding matrix W ═ V included in the precoding matrix group₀ … V_R-1]Each column vector of (1) has the following constitution

Wherein, V_iIs N_tA column vector of x 1, and,

is a plurality of modulo 1 and

5. The method according to any of claims 1-2, wherein the RI comprises a rank of the data channel;

the method further comprises the following steps:

6. The method according to any of claims 1-2, further comprising:

or

7. The method of claim 2, further comprising:

8. A method of data transmission, the method comprising:

a base station eNB receives rank indication RI of a data channel sent by a user terminal UE, determines a precoding matrix group of data to be transmitted of the UE according to the RI, and transmits the precoding matrix group to the UE, wherein the precoding matrix group comprises a plurality of precoding matrixes;

9. The method of claim 8, wherein the transmitting the set of precoding matrices to the UE comprises:

10. The method of claim 8, further comprising:

11. A method of data transmission, the method comprising:

transmitting a rank indication (PMI) and a first Precoding Matrix Indication (PMI) to the eNB, the rank indication comprising an RI, the first PMI comprising the first precoding matrix;

and receiving transmission data issued by the eNB, selecting a precoding matrix from a precoding matrix group according to the transmission sequence of the transmission data in a frequency domain and a time domain, and demodulating the transmission data through the selected precoding matrix.

12. The method of claim 11, wherein selecting a precoding matrix from a precoding matrix group according to a transmission order of the transmission data in frequency domain and time domain comprises:

determining the precoding matrix group according to the RI and the first PMI, and selecting a precoding matrix from the precoding matrix group according to the transmission sequence of the transmission data in the frequency domain and the time domain; alternatively, the first and second electrodes may be,

13. The method of claim 11, further comprising:

14. The method according to claim 11 or 12, characterized in that the method further comprises:

determining an indication of column vector selection, and transmitting a second PMI to the eNB, the second PMI including the indication of column vector selection.

15. The method of claim 14, further comprising:

16. The method of claim 11,

Wherein, V_iIs N_tA column vector of x 1, and,

is a plurality of modulo 1 and

17. The method of claim 11, 12, 13, 15 or 16, further comprising:

18. A method of data transmission, the method comprising:

transmitting a Rank Indication (RI) to a base station (eNB), the RI including a rank of the data channel;

and receiving a precoding matrix group and transmission data sent by the eNB, selecting a precoding matrix from the precoding matrix group according to the transmission sequence of the transmission data in a frequency domain and a time domain, and demodulating the transmission data through the selected precoding matrix.

19. The method of claim 18, further comprising:

the determining a rank of a data channel according to the CSI-RS includes:

20. A data transmission apparatus, characterized in that the apparatus comprises:

21. The apparatus of claim 20, wherein the first determining module comprises:

the first determining module includes:

22. The apparatus according to any of claims 20-21, wherein the first selection module comprises:

23. The apparatus according to any one of claims 20-21,

Wherein, V_iIs N_tA column vector of x 1, and,

is a plurality of modulo 1 and

values belonging to 1, -1, j, -j, N_tThe number of antenna ports included by eNB, R is the rank of the data channel included by the RI, v_iIs a column vector in a diagonal block matrix X in a first precoding matrix determined according to the first PMI.

24. The apparatus according to any of claims 20-21, wherein the RI comprises a rank of the data channel;

the device further comprises:

25. The apparatus according to any of claims 20-21, wherein the apparatus further comprises:

or

26. The apparatus of claim 21, further comprising:

a first sending module, configured to send first configuration information or second configuration information to the UE, where the first configuration information is used to indicate that the UE only feeds back the RI and the first PMI when feeding back channel state information to an eNB, and the second configuration information is used to indicate that the UE feeds back an indication of column vector selection among the RI, the first PMI, and the second PMI when feeding back channel state information to the eNB.

27. A data transmission apparatus, characterized in that the apparatus comprises:

a second transmission module, configured to transmit the precoding matrix group to the UE, where the precoding matrix group includes a plurality of precoding matrices;

28. The apparatus of claim 27,

and the second transmission module is used for sending the precoding matrix group to the UE through a Radio Resource Control (RRC) signaling.

29. The apparatus of claim 27, further comprising:

a second sending module, configured to send third configuration information to the UE, where the third configuration information is used to instruct the UE to only feed back the RI when feeding back channel state information to the eNB.

30. A data transmission apparatus, characterized in that the apparatus comprises:

a third sending module, configured to send a rank indication and a first precoding matrix indication PMI to the eNB, where the rank indication includes an RI, and the first PMI includes the first precoding matrix;

a fourth receiving module, configured to receive transmission data sent by the eNB;

a sixth determining module, configured to select a precoding matrix from a precoding matrix group according to a transmission sequence of the transmission data in a frequency domain and a time domain;

a first demodulation module, configured to demodulate the transmission data through the selected precoding matrix.

31. The apparatus of claim 30, wherein the sixth determining module comprises:

an eighth determining unit, configured to determine the precoding matrix group according to the RI and the first PMI;

the sixth determining module includes:

32. The apparatus of claim 30, further comprising:

a fifth receiving module, configured to receive first configuration information sent by the eNB, where the first configuration information is used to instruct a user equipment UE to only feed back the RI and the first PMI when feeding back channel state information to the eNB;

33. The apparatus of claim 30 or 31, further comprising:

a fourth transmitting module configured to transmit a second PMI to the eNB, the second PMI including an indication of the column vector selection.

34. The apparatus of claim 33, further comprising:

a sixth receiving module, configured to receive second configuration information sent by the eNB, where the second configuration information is used to instruct a user equipment UE to feed back an indication of column vector selection among the RI, the first PMI, and the second PMI when feeding back channel state information to the eNB;

35. The apparatus of claim 30,

Wherein, V_iIs N_tA column vector of x 1, and,

is a plurality of modulo 1 and

36. The apparatus of claim 30, 31, 32, 34 or 35, further comprising:

37. A data transmission apparatus, characterized in that the apparatus comprises:

a sixth sending module, configured to send a rank indication RI to a base station eNB, where the RI includes a rank of the data channel;

a seventh receiving module, configured to receive the precoding matrix group and the transmission data sent by the eNB;

a tenth determining module, configured to select a precoding matrix from the precoding matrix group according to a transmission order of the transmission data in a frequency domain and a time domain;

and the second demodulation module is used for demodulating the transmission data through the selected precoding matrix.

38. The apparatus of claim 37, further comprising:

an eighth receiving module, configured to receive third configuration information sent by the eNB, where the third configuration information is used to instruct a user equipment UE to only feed back the RI when feeding back channel state information to the eNB;

39. A computer-readable storage medium, in which a program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 19.